Pump with variable output



E. M. BORGO PUMP WITH VARIABLE OUTPUT Feb. 13, 1923. 1,445,285

Filed Feb. 25, 1920 2 sheets-sheet l Feb' 13, 1923. 1,445,285 E. M. BORGO PUMP WITH VARIABLE OUTPUT Filed Feb. 25, 1920 2 sheets-sheet 2 Patented Feb. 13, 1923.

EDMONDO MICHELE BORGO, OF TURIN, ITALY.

rump WITH VARIABLE OUTPUT.

Application filed February '25, 1920. Serial 1V0. 361,205.

To all whom it may concern Be it known that I, EDMONDO MICHELE 301260, a subject of the King of Italy, residing at Turin, Italy, have invented certain new and useful Improvements in Pumps with Variable Output; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enablejothers skilled in the art to which it appertains to make and use the same, referenc e being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification. s

This invention relates to a pump with variable output particularly applicable for the separate lubrication of the several cylinders of internal combustion engines and for like purposes. p

This pump consistssubstantially of a cylindrical body working also as distributor revolving tightly in a fixed chamber and driven by the motor, or the like, at a suitable ratio of speed. This body is provided with an exhaust opening which during the revolution coincides successively with sev eral exhaust passages, having suitable check Valves provided in the fixed chamber and connected at as many suppl pipes for feeding lubricant to the severa members to lubricate. The piston of the pump is mounted to slide, but prevented from turning inside the revolving body, and is actuated bythe latter with an alternating movement, opposite to the action of a sprin by means of a projectionof the bottom 0 the revolving body, which projection engages the several teeth of acrown of teethprovided at the top of the said piston and corresponding in number to that of theseveral members to be,

lubricated. Consequently, at 'each revolution of the body of the pump, the piston accomplishes a number of suctionand com-q of the Fig. 1 ;-the Fig. 3 shows the pump in another working position in. longitudinal sectionon the line -'-3", Se-of the Fig. 1 the Fig. 4 shows in longitudinal section the body ofthe pump and Its piston in another working position.

The pump, intended for the separate lubrication of four cylinders consists of the chamber 1, provided with the cover 2and destined to he fixed in a suitable point of the motor case 3, or the like, by means of .the screws 4, which by passing through suitable holes of the cover and through the corresponding holes 5 of the chamber serve at the same time for connecting the cover to the chamber 1 and the whole to the motor case3.

The chamber 1 is provided laterally of the suction passage 6 for the lubricant whose hole 6" leads to the inside of the said chamber in corespondence with a forward cavity of the latter. The said suction passageris provided with a check valve constituted preferably by a ball 7 and spring 8, coming to rest upon the terminal sleeve 9 of the feedlng pipe tightly jointed to the passage 6 by means of the union nut 10. In the body of the chamber 1 there are providedall around four inclined exhaust passages 11 leading to'the inside of the central cavity of the chamber and enlarged in.this point by A means of the enlargements 11'. Each passage 11, that reaches till against the cover 2 by which itis closed, is provided withlja check valve constituted by the ball 12 and spring 13 and communicates above with the exhaust hole 14 closed in front by the cov'e'r- 2. Each hole 14 opens to the rear in correspondence, of a sleeve 15 formed in-the body of the motor case and in which is fixed the supply tube 16 destined for feeding the lubricant to the one of the motor cylinders.

Thetubes. 16 which lead in a suitable point tothe inside of the corresponding cylinder, are preferably arranged in the inside of the motor case.v Owing to this arrangement by setting up the pum onthe motor case, there are also establishe the communications between the several'exhaust passages of the pum and the corresponding feeding tubes 16 o the lubricant to the several cylinders. It is evident that-the tubes 16 might be substituted also by suitable passages provided directly in the body of the motor case 3.

In the inside of the chamber 1 there is tightly mounted and capable of rotating, the cylindric hollow body 17 of the pump driven by the motor, or the like, under a suitable ratio of'speed. The drive is obtained for.

destined, during the rotation of the said body to communicate successively with the several exhaust passages 11, respectively with the enlargements 11' of these latter.

In the inside of the cylindric cavity of the body 17, bored according to two different diameters is mounted capable to slide axiall the hollow piston 20 having also two ifi'erent diameters of a collar 20. In the inside of the piston 20 there are provided one or several grooves 20 (four in the case of the drawing)" in which engage the corresponding teeth 2" of a sleeve 2' projecting from the internal face of the cover 2. This arrangement preventsthe rotation of the piston 20 but allows its axial sliding. In the inside of the piston in en'- gagement with the grooves20" is mounted capable of sliding but prevented from turning the bushing 21 containing the spring 22 acting against the bottom of the cavity of the plston. This bushing 21 with its beveled head 21 leans against the end 23' also beveled of the axis 23 mounted capable to rotate in the inside of the sleeve 2 and capable to be put in rotation from the outside by means of the operating lever 24. f

.The bottomof the revolving body 17 of the pump is provided with'the wedge shaped tooth 17" on which engage the wedged teeth 20" of a crown of teeth provided at the end of the head-of the piston 20., The teeth 20" are in the same number as that of the suction and exhaust strokes which piston 20-, the said tooth 17" by leaning on the shoulders ofthe teeth 20" causes the rearward movement of the piston 20, in opposition to the action of the spring 22, and after an eighth of rotation of 17 brings the piston in the position of the Figure 2. During this rearwards movement. the piston 20,. through the passage -6, the groove --17- and the holes 17" sucks the lubricant in the interior of the cavity w.

By continuing the rotation of the body 17 the piston20, forced by the spring 22, return after another eighth of rotation of 17, to its initial positionof the Fig. 3, whilst the teeth 20 slide on the sides of the tooth 17 The piston accomplishes in this manrier its compression stroke and the lubricant before sucked into a, is delivered to that of the exhaust passages 11 with which it is dilatation cannot displace axially the piston during its entire exhaust stroke. The axial movement of the bushingis realized by turning the sha ft23 by means of the operating lever 24. I In this manner for instance by turning the shaft 23 for 180 from the position of theFig. 2, its beveled edge 23' is brought in the position of the Fig. 4 and allows consequently the maximum rearwards movement of the bushing 21, whose'beveled edge 21 leans on that 23 of 23. Then the sprin 22 even if resuming its maximum of dilatation cannot push-forward the piston 20 so thatthe teeth- 20" might engage with the wedge 17"; thereby the piston remains lmmovable and the output of the pump is equal to zero. At each intermediate rotation of the shaft 23, comprised in the said maximal rotation of 180 correspond an intermediate output ofthe pump which may in this manner be regulated by insensible degrees b moving the lever 24 for an angular amp itude of 180.

In the example above describedv it is assumed that the pump is capable to furnish at each' revolution of'the body 17, four distinct portions of lubricant, but it is evident that this number may vary more or less by varying the number of the teeth 20" of the head (if the piston and consequently that of the exhaust passages. Moreover, it is as sumed that the pump is destined to the separated lubrication of the several cylinders of an internal combustion motor, but it is evident that it mavserve for many other applications generally for the separated lubrication of the several members of whatever engine.. J

I claim:

1. A pump comprising a casing having an inlet and discharge port, a cylinder fitted to rotate in said casing and having inlet and spectively, a piston in said cylinder, a cam in the cylinder and a cam on the piston cooperating therewith, and a spring in said cylinder to urge said cams into contact.

2. A pump comprising a stationary casing, having an inlet port and a plurality of outlet ports, a cylinder fitted in said casing having an inlet port and a plurality of discharge ports, the latter ports periodically brought into communication with saidoutlet ports during the rotation of the cylinder, a spring-urged piston in said cylinder and co-acting cams in said cylinder and on said piston to reciprocate the latter.

3. A pump comprising a cylindrical casing having a discharge port, a cylinder rotatable in said casing and having a distributing port and a liquid inlet, a spring urged piston reciprocable in said 0 linder, means on the piston and means in t e cyllnder cooperating with said piston means to reciprocate the piston when the cylinder 13 rotated. U

4. A pump comprislng a cyhndrical casing having a discharge port, a cylinder rotatable in said casing and having a dlstrlbuting port and a liquid inlet, a spring urged piston reciprocable in said cylinder means on the piston and means in the cylinder cooperating with said piston means to reciprocate the piston when the cyl nder is rotated and means to vary the spring pressure on the piston. I

5. A pump comprising a cylindr cal casing having a plurality of discharge ports, a cylinder rotatable in said caslng and havlng a distributing port capable of successively registering with the discharge ports, said cylinder also having a liquid inlet, a spring urged piston slidable in but not rotatable with said cylinder and controlling said liquid inlet, and cams on the end of the piston and in the end of the cylinder to. reciprocate the piston against its spring pressure, and means to Vary the spring pressure.

6. A pump comprising a cylindrical casing having dischar e ports, a cylinder mounted therein having a liquid inlet and a distributing :port, a piston in the cylinder, a spring in the piston to urge it in one direction, means in the cylinder to urge the d 1 piston in the opposite direction when said cylinder is rotated, means on said cover. to prevent the rotation of the piston and bolts fastening said cover on said casing simultaneously acting as means to secure the casing to its support.

7. A pump comprisinga casing having a liquid supply and a plurality of discharge ports from a central bore, said ports having peripheral extensions atsaid bore, a rotatable cylinder controlling said ports and having a flange at one end seated in said casing and having a plurality of liquid inlets and a distributing port, said flange having a poripheral groove connecting said inlets and registering with said supply, a piston in said cylinder controlling the inlets, a cover holding the parts in assembled position, means on the cover to prevent rotation of the cylinder, a spring holder in the piston having a camface, a spring between said holder and one end of the piston, means mounted on the cover to co-operate with said cam to adjust the position of said holder and the tension of its spring, a cam in the cylinder and a plurality of cams on the end of the piston co-operating with the cylinder cam.

In testimony that I claim the foregoing as my invention, I have signed my name.

EDMONDO MICHELE BORGO. 

